A test device for wear and corrosion of metal connectors

Abstract

This invention belongs to the field of metal testing technology, specifically disclosing a metal connector wear and corrosion testing device. The device includes a worktable and a displacement structure. A friction rod is connected to the displacement structure, and the top surface of the worktable is located below the friction rod. An electrolytic cell is detachably connected to the worktable, and a reference electrode and an auxiliary electrode are placed inside the electrolytic cell. A platform is fixed to the bottom wall of the electrolytic cell's inner cavity, and an insulating spacer is detachably fixed to the platform. A first test piece and a second test piece are embedded in the platform, and an electrolyte is injected into the electrolytic cell. This testing device, by integrating wear and corrosion testing, electrochemical testing, elastic pressure regulation, and automated control, can accurately simulate the surface contact wear and corrosion conditions of dissimilar metal connectors in an electrolyte.

Description

Technical Field

[0001] This invention belongs to the field of metal testing technology, and specifically discloses a metal connector wear and corrosion testing device. Background Technology

[0002] In industries such as marine engineering, energy and chemical engineering, transportation, and aerospace, the long-term reliability and service life of metallic materials and their components are crucial. In actual operating conditions, metallic components are often simultaneously subjected to chemical or electrochemical corrosion from the environmental medium, as well as physical effects such as mechanical wear, fretting, and sliding friction. When corrosion and wear act synergistically, they can trigger more severe forms of material failure, such as wear corrosion (also known as corrosive wear). This phenomenon is widespread in bearings, gears, fasteners, sealing rings, pipeline connections, and various moving parts. It not only accelerates material wear, leading to loss of equipment precision and sealing failure, but can also cause catastrophic accidents, resulting in huge economic losses and safety risks.

[0003] For dissimilar metal connections (such as flanges and bolted connections), wear corrosion is particularly complex. In an electrolyte, dissimilar metals form galvanic couples due to differences in electrode potential. The metal with the more negative potential acts as the anode, leading to accelerated corrosion—a phenomenon known as galvanic corrosion. When relative fretting or vibration occurs at the interface of the galvanic couple, mechanical wear continuously damages the surface passivation film or corrosion product layer, exposing the fresh metal substrate. Simultaneously, frictional heat, local stress, and strain alter the electrochemical state of the interface, triggering a strong synergistic effect between galvanic corrosion and mechanical wear, resulting in a synergistic damage effect where "1+1>2". This interaction makes failure prediction and protective design for dissimilar metal connections extremely difficult.

[0004] To study wear and corrosion behavior, assess the suitability of material pairings, and develop protective technologies, reliable laboratory simulation testing methods are urgently needed. Traditional methods typically separate wear and corrosion testing, or only conduct simple wear resistance testing in a non-electrolyte environment, which fails to accurately reflect the coupled synergistic effect of wear and corrosion. Therefore, wear and corrosion testing devices capable of simultaneously applying mechanical wear and electrochemical conditions have emerged. Common equipment is often based on modifications of pin-disc, ball-disc, or reciprocating testing machines, introducing an electrolytic cell, a reference electrode, and an auxiliary electrode to construct a three-electrode or two-electrode electrochemical testing system to monitor electrochemical parameters during the wear process. However, such devices still have significant limitations when simulating the real-world working conditions of dissimilar metal connectors: 1. Mismatch between contact mode and actual working conditions: Most devices use point contact or small-area contact modes such as pin-disc or ball-disc, while actual dissimilar metal connections (such as flange faces and bolt mating surfaces) are mostly surface or line contacts, and corrosion and wear may be distributed on two different metal surfaces. Point contact or small-area contact modes cannot realistically simulate the stress distribution, wear debris removal mechanism, and galvanic current path of dissimilar metal mating surfaces.

[0005] 2. Insufficient load control accuracy and adaptability: Traditional loading methods (such as weights and levers) lack buffering and adaptive adjustment capabilities. For dissimilar metals with significant differences in height or hardness, the actual contact stress distribution under the same nominal load is uneven. Pressure fluctuations or instantaneous separation from contact can easily occur due to uneven surfaces or elastic deformation, affecting test repeatability.

[0006] 3. Low degree of automation and data integration: Mechanical motion control and electrochemical testing systems are often independent of each other and rely on manual operation, making it difficult to effectively capture transient electrochemical responses and affecting data consistency and comparability.

[0007] 4. Poor ease of sample installation and electrical connection: Dissimilar metal testing requires the simultaneous installation of two insulated and isolated samples that need to be led out separately. Existing fixture designs are complex, insulation treatment is cumbersome, and the leads are prone to loosening during vibration. The stable placement of the reference electrode and auxiliary electrode is often neglected, affecting the stability of the electrical signal.

[0008] Furthermore, for dissimilar metal overlapping structures, existing devices mostly focus on liquid immersion environments, making it difficult to simulate actual atmospheric corrosion scenarios involving thin liquid films, crevice corrosion, and galvanic corrosion coupling.

[0009] Therefore, developing a dedicated experimental device that can more realistically, accurately, and conveniently simulate the wear and corrosion behavior of dissimilar metals is of great theoretical and engineering significance for deepening the understanding of wear and corrosion mechanisms and guiding the selection of materials and protective design for dissimilar metal connectors. Summary of the Invention

[0010] In view of this, the purpose of the present invention is to provide a metal connector wear and corrosion testing device to solve the above-mentioned problems.

[0011] To achieve the above objectives, the present invention provides a metal connector wear and corrosion testing device, including a worktable and a displacement structure connected to the worktable. A friction rod is connected to the displacement structure. The top surface of the worktable is located below the friction rod. An electrolytic cell is detachably connected to the worktable. A reference electrode and an auxiliary electrode are placed inside the electrolytic cell. A carrier is fixed to the bottom wall of the inner cavity of the electrolytic cell. An insulating spacer is detached and fixed on the platform. A first test piece and a second test piece are embedded in the platform. The first test piece and the second test piece are distributed relative to each other with the insulating spacer as the center. External lines are fixed on the bottom surface of both the first test piece and the second test piece. Electrolyte is injected into the electrolytic cell, and then the external circuits on the first and second test pieces are connected to an external electrochemical workstation. The displacement structure drives the friction rod to rub against the first and second test pieces.

[0012] In the above technical solution, the top surface height of the first test piece, the second test piece, and the insulating spacer can be freely adjusted, and the lower end of the friction rod is repeatedly rubbed on the first and second test pieces, with the friction trajectory of the friction rod perpendicular to the insulating spacer.

[0013] In the above technical solution, the stage is a base structure with an open bottom. The external wiring passes through the stage and the electrolytic cell and connects to an external electrochemical workstation. The reference electrode and the auxiliary electrode are also connected to the external electrochemical workstation. The reference electrode and the auxiliary electrode are fitted with a hanging device, which fixes the reference electrode and the auxiliary electrode to the electrolytic cell.

[0014] In the above technical solution, a touch unit is further connected to the workbench, the control terminal of the touch unit is connected to the control terminal of the electrochemical workstation with external circuits and reference electrode and auxiliary electrode, and the touch unit is connected to an external computer control device.

[0015] In the above technical solution, the displacement structure further includes a support structure vertically fixed to the top surface of the workbench. A sliding rail is fixed to the side of the support structure near the electrolytic cell. A sliding seat is provided on the sliding rail. An adjusting screw is threaded through the sliding seat. A fixing plate is rotatably connected to both the upper and lower ends of the adjusting screw. The fixing plate is fixed to the support structure. A handwheel is fixed to the upper end of the adjusting screw.

[0016] In the above technical solution, the sliding seat is further provided with a sliding groove, and an electric sliding rail is fixed on one side of the inner wall of the sliding groove. The driving end of the electric sliding rail is connected to a lower fixed tube and an upper fixed tube. A load-bearing tube is distributed above the upper fixed tube. A limit rod is inserted into the load-bearing tube. The lower end of the limit rod is fixed to the upper fixed tube. The lower fixed tube, the upper fixed tube and the load-bearing tube are all sleeved on the friction rod.

[0017] In the above technical solution, a connecting spring is further provided on the limiting rod, the upper end of the connecting spring is fixed to the load-bearing tube, and the lower end of the connecting spring is fixed to the upper fixing tube.

[0018] In the above technical solution, a load-bearing component is further sleeved on the upper end of the friction rod, the load-bearing component is fixed on the load-bearing tube, and the load-bearing tube and the upper end of the friction rod are fixed together.

[0019] In the above technical solution, the lower end of the friction rod is inserted into the interior of the electrolytic cell, the friction rod is vertically arranged above the platform, and the friction rod has a rod-shaped structure.

[0020] In the above technical solution, the drive end of the electric slide rail is further connected to two mounting discs, which are fixed by a round rod. The upper mounting disc is fixed to the upper fixing tube, and the lower mounting disc is fixed to the lower fixing tube. The structure composed of the two mounting discs slides in the slide groove.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. This testing device uses two different metal materials as the first and second test pieces, and places them in contact with a friction rod in an electrolyte solution. At the same time, an external electrochemical workstation is connected to form an electrochemical testing circuit. It can simulate friction and wear, and combine electrochemical measurement technology to reflect in real time the differences in friction coefficient, wear potential and current and other wear and corrosion behaviors of the two metal materials under the coupled action of friction and corrosion. It is closer to the working environment of actual dissimilar metal connectors and improves the authenticity and effectiveness of the test.

[0022] 2. This testing device utilizes an elastic loading system comprised of a load-bearing component, a connecting spring, and a limiting rod. This system allows for flexible adjustment of the vertical pressure exerted by the friction rod on the first and second test pieces. Increasing or decreasing the load-bearing component accommodates test pieces with varying elasticity. The connecting spring provides cushioning and recovery, effectively resolving the issues of unstable friction pressure and uneven force application caused by uneven heights or significant elasticity differences between the first and second test pieces. This ensures consistent force along the friction trajectory, prevents deformation of the first and second test pieces due to excessive compression, and improves the reliability and repeatability of the test results.

[0023] 3. The testing device uses a touch unit connected to an external computer. The touch unit has a built-in PLC control program that can uniformly control the power supply, the movement of the electric slide rail, and the friction process. This realizes the automated operation and real-time data acquisition of the friction test, reduces human error, facilitates quantitative analysis and long-term monitoring of wear resistance and corrosion behavior, and improves the standardization of the experiment and the efficiency of data processing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a diagram showing the connection structure between the sliding seat and the sliding track in this invention; Figure 3 This is a schematic diagram showing the distribution of the friction rod and the stage in this invention; Figure 4 This is a schematic diagram showing the distribution of the lower fixed tube and the upper fixed tube in this invention; Figure 5 This is a schematic diagram showing the distribution of the first and second test pieces in this invention; Figure 6 This is a schematic diagram showing the connection between the load-bearing component and the friction rod in this invention; Figure 7 This is a through-hole diagram of the adjusting screw and the sliding seat in this invention; Figure 8 This is a diagram showing the connection structure between the first and second test pieces and the stage in this invention. Figure 9 This is a diagram showing the connection structure between the mounting disc and the electric slide rail in this invention.

[0025] Figure 10 This is a schematic diagram of the wear and corrosion test results of dissimilar metal materials (316L-TC4) in Example 3; where (a) is a physical picture of the dissimilar metal connector of 316L and TC4, and (b) is a partial picture of the friction coefficient curve recorded during the wear and corrosion process.

[0026] 1. Workbench; 11. Touch unit; 12. Support structure; 13. Handwheel; 14. Adjusting screw; 15. Sliding seat; 16. Electric slide rail; 161. Mounting disc; 162. Round rod; 17. Sliding rail; 18. Fixing plate; 2. Electrolytic cell; 21. Reference electrode; 22. Auxiliary electrode; 23. Loading component; 24. Friction rod; 25. Hanging component; 26. Lower fixing tube; 27. Upper fixing tube; 28. Loading tube; 29. ​​Connecting spring; 210. Limiting rod; 3. Platform; 31. First test piece; 32. Second test piece; 33. Insulating spacer; 34. External wiring. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0029] Example 1: As Figures 1-9 As shown, the present invention provides a technical solution: The present invention is a metal connector wear and corrosion testing device, including a workbench 1 and a displacement structure connected to the workbench 1. A friction rod 24 is connected to the displacement structure. The top surface of the workbench 1 is located below the friction rod 24. An electrolytic cell 2 is detachably connected. A reference electrode 21 and an auxiliary electrode 22 are placed inside the electrolytic cell 2. A carrier 3 is fixed to the bottom wall of the inner cavity of the electrolytic cell 2. An insulating spacer 33 is detached and fixed on the platform 3. A first test piece 31 and a second test piece 32 are embedded in the platform 3. The first test piece 31 and the second test piece 32 are distributed relative to each other with the insulating spacer 33 as the center. An external line 34 is fixed on the bottom surface of both the first test piece 31 and the second test piece 32. Electrolyte is injected into the electrolytic cell 2, and then the external circuits 34 on the first test piece 31 and the second test piece 32 are connected to an external electrochemical workstation. The displacement structure drives the friction rod 24 to rub against the first test piece 31 and the second test piece 32.

[0030] The top surface heights of the first test piece 31, the second test piece 32, and the insulating spacer 33 are freely adjustable. The lower end of the friction rod 24 is repeatedly rubbed on the first test piece 31 and the second test piece 32, and the friction trajectory of the friction rod 24 is perpendicular to the insulating spacer 33.

[0031] The stage 3 is a base structure with an open bottom. The external line 34 passes through the stage 3 and the electrolytic cell 2 and connects to the external electrochemical workstation. The reference electrode 21 and the auxiliary electrode 22 are also connected to the external electrochemical workstation. The reference electrode 21 and the auxiliary electrode 22 are fitted with a hanging piece 25. The hanging piece 25 drives the reference electrode 21 and the auxiliary electrode 22 to be fixed on the electrolytic cell 2.

[0032] A touch unit 11 is connected to the workbench 1. The control terminal of the touch unit 11 is connected to the control terminal of the electrochemical workstation of the external circuit 34, the reference electrode 21, and the auxiliary electrode 22. The touch unit 11 is also connected to an external computer control device.

[0033] The displacement structure includes a support structure 12 that is vertically fixed to the top surface of the workbench 1. A sliding rail 17 is fixed on the side of the support structure 12 near the electrolytic cell 2. A sliding seat 15 is provided on the sliding rail 17. An adjusting screw 14 is threaded through the sliding seat 15. A fixing plate 18 is rotatably connected to both the upper and lower ends of the adjusting screw 14. The fixing plate 18 is fixed to the support structure 12. A handwheel 13 is fixed to the upper end of the adjusting screw 14.

[0034] A sliding groove is provided on the sliding seat 15, and an electric slide rail 16 is fixed on one side of the inner wall of the sliding groove. The drive end of the electric slide rail 16 is connected to two mounting discs 161. The two mounting discs 161 are fixed by a round rod 162. The upper mounting disc 161 is fixed to the upper fixing tube 27, and the lower mounting disc 161 is fixed to the lower fixing tube 26. The structure formed by the two mounting discs 161 slides in the sliding groove. A load-bearing tube 28 is distributed above the upper fixing tube 27. A limit rod 210 is inserted into the load-bearing tube 28. The lower end of the limit rod 210 is fixed to the upper fixing tube 27. The lower fixing tube 26, the upper fixing tube 27 and the load-bearing tube 28 are all sleeved on the friction rod 24. The lower end of the friction rod 24 is inserted into the interior of the electrolytic cell 2. The friction rod 24 is vertically distributed above the platform 3 and has a rod-shaped structure. In actual use, the insulating spacer 33 is made of insulating material to make the first test piece 31 and the second test piece 32 electrically insulated. The platform 3 is provided with a placement groove for placing the first test piece 31 and the second test piece 32. The staff places the first test piece 31 and the second test piece 32 in the groove of the platform 3, and then solders one end of the external line 34 to the first test piece 31 and the second test piece 32 with tin. The other end of the external line 34 is connected to an external electrochemical workstation. Subsequently, the staff controlled the electrochemical workstation control terminal of the external circuit 34, reference electrode 21, and auxiliary electrode 22 through the touch unit 11, which enabled current to flow through the first test piece 31, the second test piece 32, and the auxiliary electrode 22. Subsequently, the staff drove the adjusting screw 14 to rotate forward through the handwheel 13, so that the adjusting screw 14 drove the friction rod 24 to abut against the first test piece 31 and the second test piece 32 through the sliding seat 15. When the friction rod 24 abuts against the first test piece 31 and the second test piece 32, the staff controlled the electric slide rail 16 to work through the touch unit 11. The output end of the electric slide rail 16 can drive the friction rod 24 to rub against the first test piece 31 and the second test piece 32 through the upper fixed tube 27 and the lower fixed tube 26, thereby simulating and testing the wear and corrosion behavior of dissimilar metal connectors. The touch unit 11 is a PLC controller. The touch unit 11 has a built-in control program and is connected to an external computer control device. The external computer control device can record the wear and corrosion data of the friction rod 24 rubbing against the first test piece 31 and the second test piece 32 in real time through the touch unit 11. This makes it easier for the staff to obtain parameters such as the friction coefficient, load, potential, and current of the metal connector composed of the first test piece 31 and the second test piece 32 during wear and corrosion.

[0035] When the friction rod 24 rubs against the first test piece 31 and the second test piece 32, the frictional force exerted by the friction rod 24 on the first test piece 31 and the second test piece 32 is easily affected by the height of the top of the first test piece 31 and the second test piece 32 or its own elasticity. This causes the friction rod 24 to be unable to rub stably on the first test piece 31 and the second test piece 32, and the force applied by the friction rod 24 on the friction trajectory of the first test piece 31 and the second test piece 32 is also different, which will lead to frictional mismatch between the two test pieces.

[0036] Example 2: Please refer to Figures 1-9 As shown, based on Embodiment 1, the present invention provides a technical solution. Unlike Embodiment 1, in this embodiment, when the load 23 is sleeved on the friction rod 24, since the limiting rod 210 passes through the load tube 28, the limiting rod 210 can restrict the movement trajectory of the load tube 28, thereby making the load tube 28 move stably above the upper fixed tube 27, and realizing that the friction rod 24 rubs stably on the first test piece 31 and the second test piece 32.

[0037] A connecting spring 29 is sleeved on the limiting rod 210. The upper end of the connecting spring 29 is fixed to the load-bearing tube 28, and the lower end of the connecting spring 29 is fixed to the upper fixing tube 27. The upper end of the friction rod 24 is fitted with a load-bearing component 23, which is fixed on the load-bearing tube 28. The load-bearing tube 28 and the upper end of the friction rod 24 are fixed together.

[0038] In actual use, the staff can attach different numbers of load-bearing parts 23 to the upper end of the friction rod 24 according to the actual situation. Each load-bearing part 23 has the same weight. When the load-bearing part 23 is attached to the upper end of the friction rod 24, the weight of the load-bearing part 23, together with the weight of the friction rod 24, causes the friction rod 24 to move down in the lower fixed tube 26 and the upper fixed tube 27. At this time, the connecting spring 29 stores power and works, thereby causing the friction rod 24 to rub on the first test piece 31 and the second test piece 32. When the staff removes the load 23 from the top of the friction rod 24, the connecting spring 29 can move the load tube 28 upward by relying on its own restoring force. At this time, the resistance force exerted by the load tube 28 on the first test piece 31 and the second test piece 32 is reduced, thereby preventing the friction rod 24 from squeezing and deforming the first test piece 31 and the second test piece 32.

[0039] Example 3, please refer to Figure 10 As shown, the embodiment tested the 316L-TC4 dissimilar metal connector ( Figure 10 (a) Wear corrosion was carried out in a 3.5 wt.% NaCl solution medium at 25 degrees Celsius. Figure 10(b) It can be seen that there is a significant mismatch in the coefficient of friction (COF) between 316L and TC4. Specifically, 316L exhibits a higher COF value, while TC4 maintains a relatively lower COF. These results indicate that the degree of friction mismatch can be verified by conducting wear and corrosion tests on dissimilar metal connectors, laying the foundation for effectively controlling their combined friction performance.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A metal connector wear and corrosion testing device, comprising a worktable (1) and a displacement structure connected to the worktable (1), characterized in that: A friction rod (24) is connected to the displacement structure. An electrolytic cell (2) is detached and connected to the top surface of the worktable (1) below the friction rod (24). A reference electrode (21) and an auxiliary electrode (22) are placed inside the electrolytic cell (2). A platform (3) is fixed to the bottom wall of the inner cavity of the electrolytic cell (2). An insulating spacer (33) is disassembled and fixed on the platform (3). A first test piece (31) and a second test piece (32) are embedded on the platform (3). The first test piece (31) and the second test piece (32) are distributed relative to each other with the insulating spacer (33) as the center. An external line (34) is fixed on the bottom surface of the first test piece (31) and the second test piece (32). Electrolyte is injected into the electrolytic cell (2), and then the external circuit (34) on the first test piece (31) and the second test piece (32) is connected to an external electrochemical workstation. The displacement structure drives the friction rod (24) to rub against the first test piece (31) and the second test piece (32).

2. The metal connector wear and corrosion testing device according to claim 1, characterized in that, The displacement structure includes a support structure (12) that is vertically fixed to the top surface of the workbench (1). A sliding rail (17) is fixed on the side of the support structure (12) near the electrolytic cell (2). A sliding seat (15) is provided on the sliding rail (17). An adjusting screw (14) is threaded through the sliding seat (15). A fixing plate (18) is rotatably connected to both the upper and lower ends of the adjusting screw (14). The fixing plate (18) is fixed on the support structure (12). A handwheel (13) is fixed to the upper end of the adjusting screw (14).

3. The metal connector wear and corrosion testing device according to claim 2, characterized in that, The sliding seat (15) has a sliding groove, and an electric slide rail (16) is fixed on one side of the inner wall of the sliding groove. The driving end of the electric slide rail (16) is connected to a lower fixed tube (26) and an upper fixed tube (27). A load-bearing tube (28) is distributed above the upper fixed tube (27). A limit rod (210) is inserted into the load-bearing tube (28). The lower end of the limit rod (210) is fixed to the upper fixed tube (27). The lower fixed tube (26), the upper fixed tube (27) and the load-bearing tube (28) are all sleeved on the friction rod (24).

4. The metal connector wear and corrosion testing device according to claim 3, characterized in that, The drive end of the electric slide rail (16) is connected to two mounting discs (161). The two mounting discs (161) are fixed by a round rod (162). The upper mounting disc (161) is fixed to the upper fixing tube (27), and the lower mounting disc (161) is fixed to the lower fixing tube (26). The two mounting discs (161) form a structure that slides in the slide groove.

5. The metal connector wear and corrosion testing device according to claim 3, characterized in that, A connecting spring (29) is sleeved on the limiting rod (210). The upper end of the connecting spring (29) is fixed to the load tube (28), and the lower end of the connecting spring (29) is fixed to the upper fixing tube (27). A load member (23) is sleeved on the upper end of the friction rod (24). The load member (23) is fixed on the load tube (28), and the upper ends of the load tube (28) and the friction rod (24) are fixed.

6. The metal connector wear and corrosion testing device according to claim 1, characterized in that, The top surface heights of the first test piece (31), the second test piece (32), and the insulating spacer (33) are freely adjustable. The lower end of the friction rod (24) is repeatedly rubbed on the first test piece (31) and the second test piece (32). The friction trajectory of the friction rod (24) is perpendicular to the insulating spacer (33).

7. The metal connector wear and corrosion testing device according to claim 1, characterized in that, The platform (3) is a base structure with an open bottom. The external line (34) passes through the platform (3) and the electrolytic cell (2) and connects to the external electrochemical workstation. The reference electrode (21) and the auxiliary electrode (22) are also connected to the external electrochemical workstation. The reference electrode (21) and the auxiliary electrode (22) are fitted with a hanging piece (25). The hanging piece (25) drives the reference electrode (21) and the auxiliary electrode (22) to be fixed on the electrolytic cell (2).

8. The metal connector wear and corrosion testing device according to claim 1, characterized in that, The workbench (1) is connected to a touch unit (11). The control terminal of the touch unit (11) is connected to the control terminal of the electrochemical workstation of the external circuit (34), the reference electrode (21), and the auxiliary electrode (22). The touch unit (11) is connected to an external computer control device.

9. The metal connector wear and corrosion testing device according to claim 1, characterized in that, The lower end of the friction rod (24) is inserted into the interior of the electrolytic cell (2). The friction rod (24) is vertically distributed above the platform (3). The friction rod (24) has a rod-shaped structure.

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